Grooved drum with insertion pins



Feb. 20, 1962 w. ZOLLINGER 3,022,021

GROOVED DRUM WITH INSERTION PINS Filed Aug. 27. 1958 Y Q Fig.8

3 Fig.6 3 H9738 5 6 INVENTOR. M91. 7'59 Zazu/vqfk United States Patent 3,022,021 GROOVED DRUM WITH INSERTION liNS Walter Zollinger, Horgen, Zurich, Switzerland, assigns:-

to Maschinenfabrik Schweiter A.G., Horgen, Zurich,

Switzerland, a Swiss compan Filed Aug. 27, 1958, Ser. No. 757,634 Claims priority, application Switzerland Sept. 3, 1957 3 Claims. (Cl. 2 .2-43.2)

The present invention relates to a grooved drum in which the points of intersection and diversion most subject to wear and tear are reinforced by means of inserted pins formed of a hard material.

It is a known method to form grooved drums of a synthetic material and to protect the points of intersection and diversion against wear by inserted hard ceramic metal. At the points of diversion this can readily be achieved by inserting radial pins; however, this is not possible at the points of intersection because the yarn guiding grooves of the drum must be bridged at these points.

The present invention has for its object to provide both the points of intersection and the points of diversion with insertion pins which bridge the corresponding grooves.

The invention is characterized by the fact that holes are drilled into the drum surface at an acute angle to the drum axis, pins having guiding surfaces for the yarn being inserted in the said holes.

Embodiments of the invention are represented in the attached drawing in which:

FIG. 1 is an elevational view of a groove drum;

FIG. 2 is a longitudinal sectional view in which the intersecting yarn guiding grooves and an obliquely inserted straight pin are visible;

FIG. 3 is a view similar to FIG. 2 but illustrating a bent pin owing to which the contact surface for the yarn is parallel with the drum surface;

FIG. 4 is a sectional view illustrating an inserted pin with a head provided with a recess designed to guide the y FIG. 5 is an elevational view of the pin according to FIG. 4;

FIG. 6 is a plan view of the pin;

FIG. 7 is a sectional detail view showing a pin used at a point of diversion, and

FIG. 8 is a sectional detail view showing a means of heating the pin for the purpose of removing it from its bore.

The drum 1 is shown in FIG. 1 as being formed of a single integral member and is provided with two points of intersection 2 at which a pin 3 is inserted in a bore provided at an acute angle to the drum axis so as to bridge one of the grooves with its projecting portion. FIG. 2 is a longitudinal section of the drum 1 with a pin 3 and grooves 4 and 5 at an enlarged scale. The pin 3 is straight and round, and it is driven or glued into the bore. FIG. 3 shows the same arrangement with a bent pin 3. The bent portion 3a enables the contact surface for the yarn to be placed in parallel relationship with the surface of the drum 1. FIG. 4 shows a pin 3 with a head 3b provided with a recess 30. This recess enables the yarn to be guided at the centre of the point of intersection. FIG. 5 is a view of the pin 3. FIG. 7 shows a pin 3 with a head 3e designed to support the yarn at the point of diversion on the drum. The pins are advantageously fastened in the bore by means of an fiZZfiZl Fatented Feb. 243, 1552 adhesive which softens under the action of heat, such as araldite. This enables the pin to be changed when worn. For this purpose, a hole 6 is drilled into the surface of the drum 1 as shown in FIG. 8, the hole 6 giving access to the end or" the pin 3.

Application to the ends of the pin 3 of the poles 7 and 8 of an electric circuit of suiiicient amperage and low voltage enables the pin 3 to be heated rapidly and withdrawn. This arrangement also enables various designs of pin heads to be employed to guide the yarn, which can be produced cheaply by pressing and can be interchangeably inserted into the drum.

Various changes and modifications may be made without departing from the spirit and scope of the present invention and it is intended that suchobvious changes and modifications be embraced by the annexed claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

l. A drum comprising a single integral piece of material and having a longitudinal axis, said drum having grooves therein intersecting at predetermined locations of said drum subject to wear and tear, said drum having bores therein extending at an acute angle to said axis and disposed laterally of and adjacent to said locations, and guide members of relatively hard material received in said bores reinforcing said locations, each of said guide members being solely supported in an individual bore, said reinforcing members being in the form of pins having heads provided with surfaces forming guiding bridges, said surfaces being parallel with said axis of said drum.

2. A drum formed of a single integral member and having an axis, said drum having grooves therein, said grooves intersecting at locations subject to wear and tear, said drum having bores therein extending at an acute angle to said axis, said bores being disposed adjacent said locations, and reinforcing members of relatively hard material received in said bores reinforcing said locations subject to wear and tear, each of said reinforcing members being solely supported in an individual bore with said bores being formed in the walls of said grooves, said reinforcing members being provided in the form of pins having heads bridging said locations, said heads each being provided with a yarn guiding groove.

3. A drum comprising a single integral piece of material and having a longitudinal axis, said drum having grooves therein intersecting at predetermined locations of said drum subject to wear and tear, said drum being provided with bores therein extending at an acute angle to said axis and disposed adjacent said locations, and guide members at most flexed at one location along the length thereof and formed of relatively hard material received in said bores reinforcing said locations, said guide members being in the form of pins having heads provided with surfaces forming guiding bridges, each of said guide members being solely supported in an individual bore, said surfaces being parallel with said axis of said drum and extending externally of said bores.

References Cited in the tile of this patent UNITED STATES PATENTS 2,370,923 iegenthaler Mar. 6, 1945 FOREIGN PATENTS 663,451 Germany Aug. 6, 1938 50,368 France Jan. 16, 1940 

